Choose one of the following three topics for your primary post. Your primary post should address everything that the instructions call for (for the topic you choose). Your post should also be at least 125 words in length. Additionally, please respond to at least one other discussant on any topic. There is an extra credit opportunity for two of the topics.

Topic 1. Tumor protein p53. This is a library-research topic in which you are required to state your source, in the form of a web-link or other format. In your own words, please address issues (a) and (b).

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  • (a) Describe the role of p53 in normal cell division.
  • (b) Explain why mutations of the p53 gene are often associated with cancer.
  • Reminder: You may use quotations from your source, as long as the quote is brief. Ensure that most of the post is in your own words.

Extra Credit Opportunity (up to 5 points)

  • (i) you are the first person in this section to use a particular source
  • (ii) that source is clearly relevant to this discussion topic about p53

Topic 2. Sexual Reproduction in Unicellular Eukaryotes. Watch the instructor’s video about “Sexual Reproduction in Unicellular Eukaryotes”, which is found in the Instructor Insights section for this week. For a single-celled species to be capable of sexual reproduction, the species must have both haploid and diploid forms

  • (a) Explain what diploid form of the organism must be capable of doing, for the species to reproduce sexually.
  • (b) Explain what haploid form of the organism must be capable of doing, for the species to reproduce sexually.
  • Reminder: you don’t need to cite my videos or the papers that the videos are based on, but if you use any other sources, you must cite them.

Extra Credit Opportunity (up to 5 points)

For 5 points of extra credit, explain the importance of the flow cytometer to this research into sex in S. rosetta.

Topic 3. Apoptosis. Watch the Khan Academy video about apoptosis (“Apoptosis”, n.d.), then address the following issues in your own words:

  • (a) What is the difference between apoptosis and necrosis?
  • (b) What is the role of apoptosis in normal, healthy development?
  • Reminder: you don’t need to cite the Khan Academy video for this topic, but if you use any other sources, you must cite them.


Apoptosis (n.d.). Retrieved from https://www.khanacademy.org/science/biology/cellul…

Cox, J. (2017, July 23). Sexual reproduction in a unicellular eukaryote. [Kaltura video].

Cox, J. (2017, July 30). Sex in S. rosetta. [Kaltura video].

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